Malicious PDF — malware analysis report

Static analysis result for SHA-256 625804d9dd17d331…

MALICIOUS

PDF

78.7 KB Created: 2021-03-15 03:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d8b51e3e73fc3f156761994386eb8d34 SHA-1: ef2b777b42ec0c4aa6d4ed79853cbf689f91a498 SHA-256: 625804d9dd17d3311513ca964aae077550c5a19331e263611f7c8704f89d5841
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to 'maypoin.ru', which is likely a malicious domain used to host phishing content or distribute further malware. The document's structure and embedded links suggest it is part of a link farm designed to obscure the true destination, a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/award?keyword=bookkeeping+duties+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472208/normal_604792a56b962.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/iashghN/how_to_skip_alien_mission_in_gta_5.pdfIn PDF document text
    • https://vujafufitagizej.weebly.com/uploads/1/3/2/6/132696128/kemewumi-rokan-xurupawev-gizeget.pdfIn PDF document text
    • http://intekzafast.online/they_say_i_say_summary_chapter_7watej.pdfIn PDF document text
    • http://daniele.store/jilumampq88h.pdfIn PDF document text
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/7b898fb2066.pdfIn PDF document text
    • https://raguwamirib.weebly.com/uploads/1/3/4/6/134630778/salepak_lezifabi_jabemexisedexa_xigonuxapulofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450734/normal_60161d0cee896.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/hidhbhb/wowisitoxafaduzedotadam.pdfIn PDF document text
    • http://about-central.com/jeu_de_carte_solitaire_pyramidercloc.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/jefamon.pdfIn PDF document text
    • http://okclub.org/8826068783867kjw.pdfIn PDF document text
    • http://natfreshik.fun/17394438318xd351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_604840139ca24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_91702f3cfea94d3d9d05eb16572c1188.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dec7005-a5f6-474b-9cd1-127a8a3a02dc/22821013994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa45938-d32e-43bc-b82f-a4943c46cc07/free_online_project_management_certification_course.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_1feb9405d6fe4545a8eacc04654d2956.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d88c36b-3ef7-431e-8fad-737725abcb94/48020855860.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_756a3683c12e41f3b2a0a456b04e183a.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_8847922924874ff7a49912829d697a23.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 4984 bytes
SHA-256: 220b05ded29a86c7c31a22a8788b7fb4e66e451eb0a181609d2b15597f71e7a0
font_01_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 10904 bytes
SHA-256: 0a5e3a701c63e6760be6a46a8a181c46d183b4ed15692152b4ae325fa11abb38

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